utmutex.c revision 1.1.1.2.2.2
1 1.1.1.2.2.2 bouyer /******************************************************************************* 2 1.1.1.2.2.2 bouyer * 3 1.1.1.2.2.2 bouyer * Module Name: utmutex - local mutex support 4 1.1.1.2.2.2 bouyer * 5 1.1.1.2.2.2 bouyer ******************************************************************************/ 6 1.1.1.2.2.2 bouyer 7 1.1.1.2.2.2 bouyer /* 8 1.1.1.2.2.2 bouyer * Copyright (C) 2000 - 2011, Intel Corp. 9 1.1.1.2.2.2 bouyer * All rights reserved. 10 1.1.1.2.2.2 bouyer * 11 1.1.1.2.2.2 bouyer * Redistribution and use in source and binary forms, with or without 12 1.1.1.2.2.2 bouyer * modification, are permitted provided that the following conditions 13 1.1.1.2.2.2 bouyer * are met: 14 1.1.1.2.2.2 bouyer * 1. Redistributions of source code must retain the above copyright 15 1.1.1.2.2.2 bouyer * notice, this list of conditions, and the following disclaimer, 16 1.1.1.2.2.2 bouyer * without modification. 17 1.1.1.2.2.2 bouyer * 2. Redistributions in binary form must reproduce at minimum a disclaimer 18 1.1.1.2.2.2 bouyer * substantially similar to the "NO WARRANTY" disclaimer below 19 1.1.1.2.2.2 bouyer * ("Disclaimer") and any redistribution must be conditioned upon 20 1.1.1.2.2.2 bouyer * including a substantially similar Disclaimer requirement for further 21 1.1.1.2.2.2 bouyer * binary redistribution. 22 1.1.1.2.2.2 bouyer * 3. Neither the names of the above-listed copyright holders nor the names 23 1.1.1.2.2.2 bouyer * of any contributors may be used to endorse or promote products derived 24 1.1.1.2.2.2 bouyer * from this software without specific prior written permission. 25 1.1.1.2.2.2 bouyer * 26 1.1.1.2.2.2 bouyer * Alternatively, this software may be distributed under the terms of the 27 1.1.1.2.2.2 bouyer * GNU General Public License ("GPL") version 2 as published by the Free 28 1.1.1.2.2.2 bouyer * Software Foundation. 29 1.1.1.2.2.2 bouyer * 30 1.1.1.2.2.2 bouyer * NO WARRANTY 31 1.1.1.2.2.2 bouyer * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 32 1.1.1.2.2.2 bouyer * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 33 1.1.1.2.2.2 bouyer * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 34 1.1.1.2.2.2 bouyer * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 35 1.1.1.2.2.2 bouyer * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 36 1.1.1.2.2.2 bouyer * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 37 1.1.1.2.2.2 bouyer * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 38 1.1.1.2.2.2 bouyer * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 39 1.1.1.2.2.2 bouyer * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 40 1.1.1.2.2.2 bouyer * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 41 1.1.1.2.2.2 bouyer * POSSIBILITY OF SUCH DAMAGES. 42 1.1.1.2.2.2 bouyer */ 43 1.1.1.2.2.2 bouyer 44 1.1.1.2.2.2 bouyer 45 1.1.1.2.2.2 bouyer #define __UTMUTEX_C__ 46 1.1.1.2.2.2 bouyer 47 1.1.1.2.2.2 bouyer #include "acpi.h" 48 1.1.1.2.2.2 bouyer #include "accommon.h" 49 1.1.1.2.2.2 bouyer 50 1.1.1.2.2.2 bouyer #define _COMPONENT ACPI_UTILITIES 51 1.1.1.2.2.2 bouyer ACPI_MODULE_NAME ("utmutex") 52 1.1.1.2.2.2 bouyer 53 1.1.1.2.2.2 bouyer /* Local prototypes */ 54 1.1.1.2.2.2 bouyer 55 1.1.1.2.2.2 bouyer static ACPI_STATUS 56 1.1.1.2.2.2 bouyer AcpiUtCreateMutex ( 57 1.1.1.2.2.2 bouyer ACPI_MUTEX_HANDLE MutexId); 58 1.1.1.2.2.2 bouyer 59 1.1.1.2.2.2 bouyer static void 60 1.1.1.2.2.2 bouyer AcpiUtDeleteMutex ( 61 1.1.1.2.2.2 bouyer ACPI_MUTEX_HANDLE MutexId); 62 1.1.1.2.2.2 bouyer 63 1.1.1.2.2.2 bouyer 64 1.1.1.2.2.2 bouyer /******************************************************************************* 65 1.1.1.2.2.2 bouyer * 66 1.1.1.2.2.2 bouyer * FUNCTION: AcpiUtMutexInitialize 67 1.1.1.2.2.2 bouyer * 68 1.1.1.2.2.2 bouyer * PARAMETERS: None. 69 1.1.1.2.2.2 bouyer * 70 1.1.1.2.2.2 bouyer * RETURN: Status 71 1.1.1.2.2.2 bouyer * 72 1.1.1.2.2.2 bouyer * DESCRIPTION: Create the system mutex objects. This includes mutexes, 73 1.1.1.2.2.2 bouyer * spin locks, and reader/writer locks. 74 1.1.1.2.2.2 bouyer * 75 1.1.1.2.2.2 bouyer ******************************************************************************/ 76 1.1.1.2.2.2 bouyer 77 1.1.1.2.2.2 bouyer ACPI_STATUS 78 1.1.1.2.2.2 bouyer AcpiUtMutexInitialize ( 79 1.1.1.2.2.2 bouyer void) 80 1.1.1.2.2.2 bouyer { 81 1.1.1.2.2.2 bouyer UINT32 i; 82 1.1.1.2.2.2 bouyer ACPI_STATUS Status; 83 1.1.1.2.2.2 bouyer 84 1.1.1.2.2.2 bouyer 85 1.1.1.2.2.2 bouyer ACPI_FUNCTION_TRACE (UtMutexInitialize); 86 1.1.1.2.2.2 bouyer 87 1.1.1.2.2.2 bouyer 88 1.1.1.2.2.2 bouyer /* Create each of the predefined mutex objects */ 89 1.1.1.2.2.2 bouyer 90 1.1.1.2.2.2 bouyer for (i = 0; i < ACPI_NUM_MUTEX; i++) 91 1.1.1.2.2.2 bouyer { 92 1.1.1.2.2.2 bouyer Status = AcpiUtCreateMutex (i); 93 1.1.1.2.2.2 bouyer if (ACPI_FAILURE (Status)) 94 1.1.1.2.2.2 bouyer { 95 1.1.1.2.2.2 bouyer return_ACPI_STATUS (Status); 96 1.1.1.2.2.2 bouyer } 97 1.1.1.2.2.2 bouyer } 98 1.1.1.2.2.2 bouyer 99 1.1.1.2.2.2 bouyer /* Create the spinlocks for use at interrupt level */ 100 1.1.1.2.2.2 bouyer 101 1.1.1.2.2.2 bouyer Status = AcpiOsCreateLock (&AcpiGbl_GpeLock); 102 1.1.1.2.2.2 bouyer if (ACPI_FAILURE (Status)) 103 1.1.1.2.2.2 bouyer { 104 1.1.1.2.2.2 bouyer return_ACPI_STATUS (Status); 105 1.1.1.2.2.2 bouyer } 106 1.1.1.2.2.2 bouyer 107 1.1.1.2.2.2 bouyer Status = AcpiOsCreateLock (&AcpiGbl_HardwareLock); 108 1.1.1.2.2.2 bouyer if (ACPI_FAILURE (Status)) 109 1.1.1.2.2.2 bouyer { 110 1.1.1.2.2.2 bouyer return_ACPI_STATUS (Status); 111 1.1.1.2.2.2 bouyer } 112 1.1.1.2.2.2 bouyer 113 1.1.1.2.2.2 bouyer /* Mutex for _OSI support */ 114 1.1.1.2.2.2 bouyer Status = AcpiOsCreateMutex (&AcpiGbl_OsiMutex); 115 1.1.1.2.2.2 bouyer if (ACPI_FAILURE (Status)) 116 1.1.1.2.2.2 bouyer { 117 1.1.1.2.2.2 bouyer return_ACPI_STATUS (Status); 118 1.1.1.2.2.2 bouyer } 119 1.1.1.2.2.2 bouyer 120 1.1.1.2.2.2 bouyer /* Create the reader/writer lock for namespace access */ 121 1.1.1.2.2.2 bouyer 122 1.1.1.2.2.2 bouyer Status = AcpiUtCreateRwLock (&AcpiGbl_NamespaceRwLock); 123 1.1.1.2.2.2 bouyer return_ACPI_STATUS (Status); 124 1.1.1.2.2.2 bouyer } 125 1.1.1.2.2.2 bouyer 126 1.1.1.2.2.2 bouyer 127 1.1.1.2.2.2 bouyer /******************************************************************************* 128 1.1.1.2.2.2 bouyer * 129 1.1.1.2.2.2 bouyer * FUNCTION: AcpiUtMutexTerminate 130 1.1.1.2.2.2 bouyer * 131 1.1.1.2.2.2 bouyer * PARAMETERS: None. 132 1.1.1.2.2.2 bouyer * 133 1.1.1.2.2.2 bouyer * RETURN: None. 134 1.1.1.2.2.2 bouyer * 135 1.1.1.2.2.2 bouyer * DESCRIPTION: Delete all of the system mutex objects. This includes mutexes, 136 1.1.1.2.2.2 bouyer * spin locks, and reader/writer locks. 137 1.1.1.2.2.2 bouyer * 138 1.1.1.2.2.2 bouyer ******************************************************************************/ 139 1.1.1.2.2.2 bouyer 140 1.1.1.2.2.2 bouyer void 141 1.1.1.2.2.2 bouyer AcpiUtMutexTerminate ( 142 1.1.1.2.2.2 bouyer void) 143 1.1.1.2.2.2 bouyer { 144 1.1.1.2.2.2 bouyer UINT32 i; 145 1.1.1.2.2.2 bouyer 146 1.1.1.2.2.2 bouyer 147 1.1.1.2.2.2 bouyer ACPI_FUNCTION_TRACE (UtMutexTerminate); 148 1.1.1.2.2.2 bouyer 149 1.1.1.2.2.2 bouyer 150 1.1.1.2.2.2 bouyer /* Delete each predefined mutex object */ 151 1.1.1.2.2.2 bouyer 152 1.1.1.2.2.2 bouyer for (i = 0; i < ACPI_NUM_MUTEX; i++) 153 1.1.1.2.2.2 bouyer { 154 1.1.1.2.2.2 bouyer AcpiUtDeleteMutex (i); 155 1.1.1.2.2.2 bouyer } 156 1.1.1.2.2.2 bouyer 157 1.1.1.2.2.2 bouyer AcpiOsDeleteMutex (AcpiGbl_OsiMutex); 158 1.1.1.2.2.2 bouyer 159 1.1.1.2.2.2 bouyer /* Delete the spinlocks */ 160 1.1.1.2.2.2 bouyer 161 1.1.1.2.2.2 bouyer AcpiOsDeleteLock (AcpiGbl_GpeLock); 162 1.1.1.2.2.2 bouyer AcpiOsDeleteLock (AcpiGbl_HardwareLock); 163 1.1.1.2.2.2 bouyer 164 1.1.1.2.2.2 bouyer /* Delete the reader/writer lock */ 165 1.1.1.2.2.2 bouyer 166 1.1.1.2.2.2 bouyer AcpiUtDeleteRwLock (&AcpiGbl_NamespaceRwLock); 167 1.1.1.2.2.2 bouyer return_VOID; 168 1.1.1.2.2.2 bouyer } 169 1.1.1.2.2.2 bouyer 170 1.1.1.2.2.2 bouyer 171 1.1.1.2.2.2 bouyer /******************************************************************************* 172 1.1.1.2.2.2 bouyer * 173 1.1.1.2.2.2 bouyer * FUNCTION: AcpiUtCreateMutex 174 1.1.1.2.2.2 bouyer * 175 1.1.1.2.2.2 bouyer * PARAMETERS: MutexID - ID of the mutex to be created 176 1.1.1.2.2.2 bouyer * 177 1.1.1.2.2.2 bouyer * RETURN: Status 178 1.1.1.2.2.2 bouyer * 179 1.1.1.2.2.2 bouyer * DESCRIPTION: Create a mutex object. 180 1.1.1.2.2.2 bouyer * 181 1.1.1.2.2.2 bouyer ******************************************************************************/ 182 1.1.1.2.2.2 bouyer 183 1.1.1.2.2.2 bouyer static ACPI_STATUS 184 1.1.1.2.2.2 bouyer AcpiUtCreateMutex ( 185 1.1.1.2.2.2 bouyer ACPI_MUTEX_HANDLE MutexId) 186 1.1.1.2.2.2 bouyer { 187 1.1.1.2.2.2 bouyer ACPI_STATUS Status = AE_OK; 188 1.1.1.2.2.2 bouyer 189 1.1.1.2.2.2 bouyer 190 1.1.1.2.2.2 bouyer ACPI_FUNCTION_TRACE_U32 (UtCreateMutex, MutexId); 191 1.1.1.2.2.2 bouyer 192 1.1.1.2.2.2 bouyer 193 1.1.1.2.2.2 bouyer if (!AcpiGbl_MutexInfo[MutexId].Mutex) 194 1.1.1.2.2.2 bouyer { 195 1.1.1.2.2.2 bouyer Status = AcpiOsCreateMutex (&AcpiGbl_MutexInfo[MutexId].Mutex); 196 1.1.1.2.2.2 bouyer AcpiGbl_MutexInfo[MutexId].ThreadId = ACPI_MUTEX_NOT_ACQUIRED; 197 1.1.1.2.2.2 bouyer AcpiGbl_MutexInfo[MutexId].UseCount = 0; 198 1.1.1.2.2.2 bouyer } 199 1.1.1.2.2.2 bouyer 200 1.1.1.2.2.2 bouyer return_ACPI_STATUS (Status); 201 1.1.1.2.2.2 bouyer } 202 1.1.1.2.2.2 bouyer 203 1.1.1.2.2.2 bouyer 204 1.1.1.2.2.2 bouyer /******************************************************************************* 205 1.1.1.2.2.2 bouyer * 206 1.1.1.2.2.2 bouyer * FUNCTION: AcpiUtDeleteMutex 207 1.1.1.2.2.2 bouyer * 208 1.1.1.2.2.2 bouyer * PARAMETERS: MutexID - ID of the mutex to be deleted 209 1.1.1.2.2.2 bouyer * 210 1.1.1.2.2.2 bouyer * RETURN: Status 211 1.1.1.2.2.2 bouyer * 212 1.1.1.2.2.2 bouyer * DESCRIPTION: Delete a mutex object. 213 1.1.1.2.2.2 bouyer * 214 1.1.1.2.2.2 bouyer ******************************************************************************/ 215 1.1.1.2.2.2 bouyer 216 1.1.1.2.2.2 bouyer static void 217 1.1.1.2.2.2 bouyer AcpiUtDeleteMutex ( 218 1.1.1.2.2.2 bouyer ACPI_MUTEX_HANDLE MutexId) 219 1.1.1.2.2.2 bouyer { 220 1.1.1.2.2.2 bouyer 221 1.1.1.2.2.2 bouyer ACPI_FUNCTION_TRACE_U32 (UtDeleteMutex, MutexId); 222 1.1.1.2.2.2 bouyer 223 1.1.1.2.2.2 bouyer 224 1.1.1.2.2.2 bouyer AcpiOsDeleteMutex (AcpiGbl_MutexInfo[MutexId].Mutex); 225 1.1.1.2.2.2 bouyer 226 1.1.1.2.2.2 bouyer AcpiGbl_MutexInfo[MutexId].Mutex = NULL; 227 1.1.1.2.2.2 bouyer AcpiGbl_MutexInfo[MutexId].ThreadId = ACPI_MUTEX_NOT_ACQUIRED; 228 1.1.1.2.2.2 bouyer } 229 1.1.1.2.2.2 bouyer 230 1.1.1.2.2.2 bouyer 231 1.1.1.2.2.2 bouyer /******************************************************************************* 232 1.1.1.2.2.2 bouyer * 233 1.1.1.2.2.2 bouyer * FUNCTION: AcpiUtAcquireMutex 234 1.1.1.2.2.2 bouyer * 235 1.1.1.2.2.2 bouyer * PARAMETERS: MutexID - ID of the mutex to be acquired 236 1.1.1.2.2.2 bouyer * 237 1.1.1.2.2.2 bouyer * RETURN: Status 238 1.1.1.2.2.2 bouyer * 239 1.1.1.2.2.2 bouyer * DESCRIPTION: Acquire a mutex object. 240 1.1.1.2.2.2 bouyer * 241 1.1.1.2.2.2 bouyer ******************************************************************************/ 242 1.1.1.2.2.2 bouyer 243 1.1.1.2.2.2 bouyer ACPI_STATUS 244 1.1.1.2.2.2 bouyer AcpiUtAcquireMutex ( 245 1.1.1.2.2.2 bouyer ACPI_MUTEX_HANDLE MutexId) 246 1.1.1.2.2.2 bouyer { 247 1.1.1.2.2.2 bouyer ACPI_STATUS Status; 248 1.1.1.2.2.2 bouyer ACPI_THREAD_ID ThisThreadId; 249 1.1.1.2.2.2 bouyer 250 1.1.1.2.2.2 bouyer 251 1.1.1.2.2.2 bouyer ACPI_FUNCTION_NAME (UtAcquireMutex); 252 1.1.1.2.2.2 bouyer 253 1.1.1.2.2.2 bouyer 254 1.1.1.2.2.2 bouyer if (MutexId > ACPI_MAX_MUTEX) 255 1.1.1.2.2.2 bouyer { 256 1.1.1.2.2.2 bouyer return (AE_BAD_PARAMETER); 257 1.1.1.2.2.2 bouyer } 258 1.1.1.2.2.2 bouyer 259 1.1.1.2.2.2 bouyer ThisThreadId = AcpiOsGetThreadId (); 260 1.1.1.2.2.2 bouyer 261 1.1.1.2.2.2 bouyer #ifdef ACPI_MUTEX_DEBUG 262 1.1.1.2.2.2 bouyer { 263 1.1.1.2.2.2 bouyer UINT32 i; 264 1.1.1.2.2.2 bouyer /* 265 1.1.1.2.2.2 bouyer * Mutex debug code, for internal debugging only. 266 1.1.1.2.2.2 bouyer * 267 1.1.1.2.2.2 bouyer * Deadlock prevention. Check if this thread owns any mutexes of value 268 1.1.1.2.2.2 bouyer * greater than or equal to this one. If so, the thread has violated 269 1.1.1.2.2.2 bouyer * the mutex ordering rule. This indicates a coding error somewhere in 270 1.1.1.2.2.2 bouyer * the ACPI subsystem code. 271 1.1.1.2.2.2 bouyer */ 272 1.1.1.2.2.2 bouyer for (i = MutexId; i < ACPI_NUM_MUTEX; i++) 273 1.1.1.2.2.2 bouyer { 274 1.1.1.2.2.2 bouyer if (AcpiGbl_MutexInfo[i].ThreadId == ThisThreadId) 275 1.1.1.2.2.2 bouyer { 276 1.1.1.2.2.2 bouyer if (i == MutexId) 277 1.1.1.2.2.2 bouyer { 278 1.1.1.2.2.2 bouyer ACPI_ERROR ((AE_INFO, 279 1.1.1.2.2.2 bouyer "Mutex [%s] already acquired by this thread [%u]", 280 1.1.1.2.2.2 bouyer AcpiUtGetMutexName (MutexId), 281 1.1.1.2.2.2 bouyer (UINT32) ThisThreadId)); 282 1.1.1.2.2.2 bouyer 283 1.1.1.2.2.2 bouyer return (AE_ALREADY_ACQUIRED); 284 1.1.1.2.2.2 bouyer } 285 1.1.1.2.2.2 bouyer 286 1.1.1.2.2.2 bouyer ACPI_ERROR ((AE_INFO, 287 1.1.1.2.2.2 bouyer "Invalid acquire order: Thread %u owns [%s], wants [%s]", 288 1.1.1.2.2.2 bouyer (UINT32) ThisThreadId, AcpiUtGetMutexName (i), 289 1.1.1.2.2.2 bouyer AcpiUtGetMutexName (MutexId))); 290 1.1.1.2.2.2 bouyer 291 1.1.1.2.2.2 bouyer return (AE_ACQUIRE_DEADLOCK); 292 1.1.1.2.2.2 bouyer } 293 1.1.1.2.2.2 bouyer } 294 1.1.1.2.2.2 bouyer } 295 1.1.1.2.2.2 bouyer #endif 296 1.1.1.2.2.2 bouyer 297 1.1.1.2.2.2 bouyer ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, 298 1.1.1.2.2.2 bouyer "Thread %u attempting to acquire Mutex [%s]\n", 299 1.1.1.2.2.2 bouyer (UINT32) ThisThreadId, AcpiUtGetMutexName (MutexId))); 300 1.1.1.2.2.2 bouyer 301 1.1.1.2.2.2 bouyer Status = AcpiOsAcquireMutex (AcpiGbl_MutexInfo[MutexId].Mutex, 302 1.1.1.2.2.2 bouyer ACPI_WAIT_FOREVER); 303 1.1.1.2.2.2 bouyer if (ACPI_SUCCESS (Status)) 304 1.1.1.2.2.2 bouyer { 305 1.1.1.2.2.2 bouyer ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Thread %u acquired Mutex [%s]\n", 306 1.1.1.2.2.2 bouyer (UINT32) ThisThreadId, AcpiUtGetMutexName (MutexId))); 307 1.1.1.2.2.2 bouyer 308 1.1.1.2.2.2 bouyer AcpiGbl_MutexInfo[MutexId].UseCount++; 309 1.1.1.2.2.2 bouyer AcpiGbl_MutexInfo[MutexId].ThreadId = ThisThreadId; 310 1.1.1.2.2.2 bouyer } 311 1.1.1.2.2.2 bouyer else 312 1.1.1.2.2.2 bouyer { 313 1.1.1.2.2.2 bouyer ACPI_EXCEPTION ((AE_INFO, Status, 314 1.1.1.2.2.2 bouyer "Thread %u could not acquire Mutex [0x%X]", 315 1.1.1.2.2.2 bouyer (UINT32) ThisThreadId, MutexId)); 316 1.1.1.2.2.2 bouyer } 317 1.1.1.2.2.2 bouyer 318 1.1.1.2.2.2 bouyer return (Status); 319 1.1.1.2.2.2 bouyer } 320 1.1.1.2.2.2 bouyer 321 1.1.1.2.2.2 bouyer 322 1.1.1.2.2.2 bouyer /******************************************************************************* 323 1.1.1.2.2.2 bouyer * 324 1.1.1.2.2.2 bouyer * FUNCTION: AcpiUtReleaseMutex 325 1.1.1.2.2.2 bouyer * 326 1.1.1.2.2.2 bouyer * PARAMETERS: MutexID - ID of the mutex to be released 327 1.1.1.2.2.2 bouyer * 328 1.1.1.2.2.2 bouyer * RETURN: Status 329 1.1.1.2.2.2 bouyer * 330 1.1.1.2.2.2 bouyer * DESCRIPTION: Release a mutex object. 331 1.1.1.2.2.2 bouyer * 332 1.1.1.2.2.2 bouyer ******************************************************************************/ 333 1.1.1.2.2.2 bouyer 334 1.1.1.2.2.2 bouyer ACPI_STATUS 335 1.1.1.2.2.2 bouyer AcpiUtReleaseMutex ( 336 1.1.1.2.2.2 bouyer ACPI_MUTEX_HANDLE MutexId) 337 1.1.1.2.2.2 bouyer { 338 1.1.1.2.2.2 bouyer ACPI_THREAD_ID ThisThreadId; 339 1.1.1.2.2.2 bouyer 340 1.1.1.2.2.2 bouyer 341 1.1.1.2.2.2 bouyer ACPI_FUNCTION_NAME (UtReleaseMutex); 342 1.1.1.2.2.2 bouyer 343 1.1.1.2.2.2 bouyer 344 1.1.1.2.2.2 bouyer ThisThreadId = AcpiOsGetThreadId (); 345 1.1.1.2.2.2 bouyer ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Thread %u releasing Mutex [%s]\n", 346 1.1.1.2.2.2 bouyer (UINT32) ThisThreadId, AcpiUtGetMutexName (MutexId))); 347 1.1.1.2.2.2 bouyer 348 1.1.1.2.2.2 bouyer if (MutexId > ACPI_MAX_MUTEX) 349 1.1.1.2.2.2 bouyer { 350 1.1.1.2.2.2 bouyer return (AE_BAD_PARAMETER); 351 1.1.1.2.2.2 bouyer } 352 1.1.1.2.2.2 bouyer 353 1.1.1.2.2.2 bouyer /* 354 1.1.1.2.2.2 bouyer * Mutex must be acquired in order to release it! 355 1.1.1.2.2.2 bouyer */ 356 1.1.1.2.2.2 bouyer if (AcpiGbl_MutexInfo[MutexId].ThreadId == ACPI_MUTEX_NOT_ACQUIRED) 357 1.1.1.2.2.2 bouyer { 358 1.1.1.2.2.2 bouyer ACPI_ERROR ((AE_INFO, 359 1.1.1.2.2.2 bouyer "Mutex [0x%X] is not acquired, cannot release", MutexId)); 360 1.1.1.2.2.2 bouyer 361 1.1.1.2.2.2 bouyer return (AE_NOT_ACQUIRED); 362 1.1.1.2.2.2 bouyer } 363 1.1.1.2.2.2 bouyer 364 1.1.1.2.2.2 bouyer #ifdef ACPI_MUTEX_DEBUG 365 1.1.1.2.2.2 bouyer { 366 1.1.1.2.2.2 bouyer UINT32 i; 367 1.1.1.2.2.2 bouyer /* 368 1.1.1.2.2.2 bouyer * Mutex debug code, for internal debugging only. 369 1.1.1.2.2.2 bouyer * 370 1.1.1.2.2.2 bouyer * Deadlock prevention. Check if this thread owns any mutexes of value 371 1.1.1.2.2.2 bouyer * greater than this one. If so, the thread has violated the mutex 372 1.1.1.2.2.2 bouyer * ordering rule. This indicates a coding error somewhere in 373 1.1.1.2.2.2 bouyer * the ACPI subsystem code. 374 1.1.1.2.2.2 bouyer */ 375 1.1.1.2.2.2 bouyer for (i = MutexId; i < ACPI_NUM_MUTEX; i++) 376 1.1.1.2.2.2 bouyer { 377 1.1.1.2.2.2 bouyer if (AcpiGbl_MutexInfo[i].ThreadId == ThisThreadId) 378 1.1.1.2.2.2 bouyer { 379 1.1.1.2.2.2 bouyer if (i == MutexId) 380 1.1.1.2.2.2 bouyer { 381 1.1.1.2.2.2 bouyer continue; 382 1.1.1.2.2.2 bouyer } 383 1.1.1.2.2.2 bouyer 384 1.1.1.2.2.2 bouyer ACPI_ERROR ((AE_INFO, 385 1.1.1.2.2.2 bouyer "Invalid release order: owns [%s], releasing [%s]", 386 1.1.1.2.2.2 bouyer AcpiUtGetMutexName (i), AcpiUtGetMutexName (MutexId))); 387 1.1.1.2.2.2 bouyer 388 1.1.1.2.2.2 bouyer return (AE_RELEASE_DEADLOCK); 389 1.1.1.2.2.2 bouyer } 390 1.1.1.2.2.2 bouyer } 391 1.1.1.2.2.2 bouyer } 392 1.1.1.2.2.2 bouyer #endif 393 1.1.1.2.2.2 bouyer 394 1.1.1.2.2.2 bouyer /* Mark unlocked FIRST */ 395 1.1.1.2.2.2 bouyer 396 1.1.1.2.2.2 bouyer AcpiGbl_MutexInfo[MutexId].ThreadId = ACPI_MUTEX_NOT_ACQUIRED; 397 1.1.1.2.2.2 bouyer 398 1.1.1.2.2.2 bouyer AcpiOsReleaseMutex (AcpiGbl_MutexInfo[MutexId].Mutex); 399 1.1.1.2.2.2 bouyer return (AE_OK); 400 1.1.1.2.2.2 bouyer } 401 1.1.1.2.2.2 bouyer 402 1.1.1.2.2.2 bouyer 403
Indexes created Thu Oct 02 01:09:59 GMT 2025